Safety device.



C- F. ROOT.

SAFETY DEVICE.

APPLICATION FILED ocr. 30. m4.

1,298,568, Patented Mar. 25,1919. Y

3 SHEETS-SHEET l- WITNESSES C. F. ROOT.

SAFETY DEVICE.

APPLICATION FILED OCT. 30. l9l4.

Patented. Mal-.25, 1919.

3 SHEETS-SHEET 2- ljiy g. 3

,JNVE/VTOR A MZL/MW 1 u fllforney WZTNESSES:

QM g/w BY C. F. ROOT. SAFETY DEVICE.

APPLICATION FILED OCT. 30. 19M.

1,298,568. Patented M111. 19m.

3 SHEETS-SHEET 3- 1 [VI/EN TOR I 72x5; Alf/2711a W1 TNESSES UNITEDSTATES PATENT o EIoE.

CHARLES F. ROOT, OF RAVEENA, OHIO, ASSIG-NOR OF ONE-FOURTH TO BYRON 0.CONN OF MANSFIELD, OHIO.

SAFETY DEVICE.

Specification of Letters Patent.

Patented Mar. 25, 1919.

Application filed October 30, 1914. Serial No. 869,468.

To all whom it may concern:

Be it known that I, CHARLEsF. BOOT, a citizen of the United States ofAmerica, re-

siding at Ravenna, in the county of Por-- that im arts movement to thereciprocating.

or oscillating work engaging element from operating when an obstructionis inadvertently or otherwise placed between the element and the anvilor bed and upon engagement of the element with the obstruction.

It is well known in the operation of machines, that are provided with areciprocating or oscillating work engaging element which exerts apressure vupon an anvil or bed, that there is great danger of theoperators fingers or hands being inadvertently placed between the anvilor bed and the reciprocating or oscillating element that exerts apressure to' perform the work with the result that the fingers or handsare crushedor injured.

This is especially true when it is necessary for the operator of themachine to perform work that requires him to place his hands or fingersin close proximity to that part of the anvil or bed upon which the workengaging. element exerts apressure to perform its work and inmanipulatlng the work the operators hands or fingers are liable to slipbetween the work engaging element and the anvil or bed at the time thework engaging element is. about to exert a pressure to perform its workthereby in- ,bed to perform the work when an obstruction is interposedbetween the anvil or bed and the reciprocating or oscillating element.

Further, the invention aims to provide means which is incorporated'inthe reciprocating or oscillating element so as to only render the latteroperative or rigid (at a predetermined point) just prior to or at theinstant of the commencement of the punching, pressing, printing, joiningor stamping operation, or, in other words, at the instant that thereciprocating or oscillating element is about to enter into actual orphysical contact with the work.

. The invention further provides means which is sensitive to operationby the finger or hand of the operator, should the finger or hand be in aposition subject to injury by the reciprocating or oscillating element,without actual injury to the finger or hand.

Further, the invention aims to provide a structure which can be adjustedto operate in connection with material possessed of varying thicknesses.

The objects above described are set forth in Letters Patent ranted to mehearing date .of March 9, 1915,?Patent Number 1,131,161;

pending application bearing Serial Number 857.016, filed Aug. '17, 1914;and pending application Serial No. 864,974, filed Oct. 5, 1914; and thepresent application has the same objects in view in a generic sense butincludes specific improvements in the structure described in saidapplication, and consists in the following new features:

' A cam operated coupling member which is adapted to couple and uncouplea link mechanism to and from the crank pin, a separable stationary camplate for operating the coupling member that can be attached to andremoved from the driving means of a reciprocating or oscillating element of a machine without changing or altering the machine or drivingmeans, and means for coupling the work engaging element to andpositively preventing the crank manner that when the work engagingelement is subjected to resistance or pressure before the work engaglngelement reaches a predetermined point in its working stroke,

that/it will tidle instantly because the crank pin of the driving meansis permitted to complete its working stroke. freely and inde lowinginstrumentalities' p a pendent of there is DOfI'lOillOIl between theparts comprising thecoupling means to be overcome.

Figure 1' is a frontelevation of a conven+ is tional type of alstayingmachineshowing mounted thereon) and work engag ngQelement.

my invention appliedthereto and also showing the finger of the operatorinterposedbetween the anvil (which has a paper box the rec procating Inthis View the couplin'gmemberis shown in uncoupled position as the workengaging element has been subjected to pressure Q by the finger beforereaching the p e-determined pressure point of its working stroke.

i Fig.2 is a detail view, in front elevation, of the slotted link,coupling member; stationary cam late, and auxiliary parts show- H {ingthe coup ing member in uncoupled positionin full linesand in coupledposition in dotted lines.

, i ,Fi 3:is-afside ,view partly in section "showlngfthe slotted amember mounted thereon,

' bled with thestationary cam plate, the end of which 'is loosely fittedover the periphery link with the coupling and both assemof the diskofthe driving means.

7 of F g.1" on a reduced scal .Fi 4'isa'side'elevation partly in section6- Fig. 5 ,is a side elevation of the slotted end of theli nk howingayielding frictionmechanism ap' lied thereto.' fFig. a plan view partlyin section of i In ' the shaft being journaled in suitable bear-"thereto;

type of a staying imparted to the driving shaft 1 by the driv- Fig. 5 v

p the drawings,'thc driving sh aft 1 ,is provided with a disk 2 having acrank 'pin' 3,

arm machine.

ings in the" L" shape 4 of a conventional Movement is ing pulley 5.Ahead 6 reciprocates between the ways 7 and has a stud .haft 8 secured Afollower or work-engaging elemerit 9 is securely attached to the head6and 'coeperates with the usual anvil (or bed)*10 of a staying machine orthe like.

Forthe purpose of connecting the stud shaft8 of the head to the crank 3of the driving shaftl, by means of which a'reciprocating movement isimparted to the head 6, a link 11 which is adapted to be coupled thecoupling means and becauseplate is provided witha cam 25 ment-to theyondthepoint 30 of the cam at and to messes withthecrank pin 3 by thecoupling member 12, is provided. The link 11 is cutaway or reduced onone side thereof at 13 forming va shoulder 14. A circular depression 15is. formed in the side of the link that forms the shoulder 14- and-theend 16 of the coupling member is pivotally fitted in said circulardepression.

The circular depression tiguous with the cut away portion 13" and islocated so as to provide a pocket for the end16 of the cou lingmember,-by means of 15 is formed conwhich the coupling member ismaintained in its proper place. Abushing vided with "an annular flange18 is refer ably mounted upon the crank pinn T e link '11 is providedwith an oblongslot In assembling, applying and constructing my safetydevice, is provided having its upper end counterbored at 21" to fit overthe disk'2 andwthe other end is'provided-With a slot-22 to fit theperiphery of the bushing 23 by means of which the 'statlonary place andprovides a clearance space for the stud shaft'8 to travel in. ."Thecrank'pin 3 projects through the aperture 24: of the cam plate.-The:link 11 17 which is procam plate is held in -r a stationarycamplate-2O carrying the coupling member is+loosely the crank pin or thebushing Fig. 2. Thecam and apin 26 to the'coupling member and is mountedupon 17 thereof, as shown in is secured adapted to coiiperate with thecam to actuatethe coupling member. Anaperture27, is

formed in one end of theilink 11 to provide a bearing for the stud shaft8 of the head 6. An annular flange 28 isprovided on the bushing 23 forthe purpose of keeping the stationary cam plate andlink in juxtaposition to" each other.

- The operation of my device upon every revolution-of the driving shaft,is asfollows When movement 1s imparted to the drivl ing'shaft the crankin3 imparts a combined oscillatingand reciprocating movelink whichcarries the coupling member with it. When the; crank. pin

which carries the link'commences or is about to travel upon its down orworking stroke,

the 'throwflof the link in one direction forces the cam pin-2 6in'contact with the point 29 of the cam25 thereby actuating the.coupling member and-forcing it torock -to'its un--1 coupled position, asshown in full lines in Fig. 2-, the cou ling member then remains-in saiduncouple position during its working stroke until the pin 26 reaches andasses bethe pin is released from the cam, permitting the couplingmemberto rock upon its pivot be forced to its coupled position which bringsthe end 31 of thecoupling which point member directly underneath thecrank pin 3 I.

in a position to receive pressure from the crank pin during the balanceof the working stroke.

When the link reaches the end of its working stroke and starts its up oridle stroke, the throw of the link in the opposite or reverse directioncarries the pin 26 through the clearance space 32, which is formed inthe cam plate, until it again reaches the point 29 of the cam 25 atvwhich time the above described operation again takes place. A coilspring 33 is attached to the link and coupling member 12 andnormallyexerts its tension to rock the coupling member and force it to itscoupled position beneath the crank pm so that at the instant the cam pin26 is released, the end 31 of the coupling member is forced beneath andcoupled with the crank pin, as

shown in dotted lines in Fig. 2.

In practice, I have found it'convenient to arrange the cam so that itwill permit the coupling member to couple the crank pin to the link forthe purpose of exerting a pressure upon the work engaging element justprior to its acting on the work. It is apparent, however, that the crankpin can be coupled to the link for exerting a pressure upon the workengaging element at varying points in its worklng stroke by changing thedimensions of the cam.

The above describes the operation of my device when it is operatingnormally without any obstruction bein projected or interposed betweenthe wor engaging element and its anvil or bed.

If an obstruction, as for instance the finger 34, is interposedorprojected between the work engagin element 9 and the work on the anvil10 bed) and the work engaging element contacts with said obstruction inmaking its working stroke before it reaches the predetermined oint atwhich it is subjected to pressure or the urpose of actin ,upon the work,the head Wlll be arrested an idle. and the crank pin will travel in theslot 19 freely and independent of .the link or its mechanism as the campin will be in contact with the cam positively preventing the couplingmember from being forced by the spring 33 to coupled position as shownby dotted-lines in Fig. 2. The crank pin continues to travel freely inthe slot 19 until the obstruction is removed permitting the head andlink to drop by gravity, the link sliding in the slot 19 over theperiphery of the crank pin until the cam pin passes the point 30 of thecam 25 at which point the pin enters the clearance space 32permittingthe coupling member to be again forced into cFoupl2ed positionas shown by dotted lines in My device is so constructed that the workengaging element is preferably not subjected to pressure to perform itswork untilit is in close proximity, to or just about to contact with thework so that any object, such as a .a proper relative position forcoupling the crank pin to the link.

Attention is called to the fact that the coupling member is held inuncoupled position by cam action until the work engaging element reachesa predetermined point in its Working stroke, and that the statlonary camplate can be readily attached to the end of the driving shaft and heldin place by the bushing 23 without altering the machine in any way andwithout the use of any appliance other than the device itself which isself contained.

It will further be noted that the parts cannot be improperly assembledas they must be mounted and held upon the bushing or crank pin inoperative relation preparatory to connecting them to a staying machineor the like. The coupling member is prevented from rocking too farunderneath the crank pin by the stop 37.

The combination, construction and arrangement of the parts as abovedescribed, provide a non-collapsible means for connecting the crank pmand work engagmg element which permits the crank pin to exert a pressureupon the Work engagmg element at a predetermined point in its workingstroke when its path is free and means to permit the crank pin to travelfreely and independent of any mechanism when the work engaging elementis subjected to pressure prior to its reaching said predetermined pointin its Working stroke.

What is claimed is:

1. In a safety device, in combination with a reciprocating work engagingelement, a driving means, and means to connect the driving means andwork engaging element including a stationary cam plate carried by thedriving means and having a cam formed therein, a link, a coupling membermovably connected to the link and normally tending to operativemovement, and means on the coupling member to engage the cam to hold themember inoperative until the work-enmechanism andhaving a cam formedtherein i the cam to hold the coupling member from driving means, saidcoupling member being carried by and pivotally seated on said link, astationary plate connected to the driving and its free end bifurcated tofit the stud shaft, and means on the coupling member to cooperate withthe cam, said cam being formed so that said coupling member is preventedfrom exerting a pressure upon the work engaging element until it reachesa predetermined point, in its working stroke.

4. A safety attachment for machines equipped with a reciprocatingwork-engaging element, a driver and an anvil, and means to actuate saidelement from the driver comprising a link, a coupling member on the linkand a stationary cam plate to move said coupling member from engagement.with the driver, said coupling member being movable transversely of they axis of the driver to and from a position of direct couplingengagement with the driver. 5. In combination with a work engagingelement, an anvil and a driving mechanism having a crank pin, a linkslidably attached to said crank pin, a coupling member cooperativedirectly with the crank pin and pivotally attached to said link, andmeans to actuate the coupling member to auto matically and rigidlycouple the link to the crank pin so as to cause the work engagingelement to exert pressure upon the anvil at apredetermined point in itsworking stroke. p 4

6. In combination with a Workengaging element carrying a stud shaft anda bushing, ananvil and a driving mechanism having a crank pin, a linkslidably attached to said crank pin, a coupling member directlycooperative with the crank pin and pivotally attached to said link, andstationary cam means to actuate the coupling member to automatically andrigidly hold the link in uncoupled relation to the crank pin so as tocause the work engaging element to avoid pressure upon the anvil if theelement encounters an object extraneous to the work before it reaches apredetermined point in its working stroke.

7. In combination with a work engaging element and driving mechanismembodying a crank, means to automatically couple said driving mechanismand "Work engaging element comprisinga rigid link and a coupling member,said coupling member being piv-- oted on the link and'movabletransversely of the axis of the crank 'to and from a position of directcoupling'engagement with the crank, and means toiprevent'said couplingmember and link from operating the work engaging element when an objectextraneous to the work is engaged by the element while the latter isupon its working stroke.

8. In combination with a work engaging element and a driving mechanismembodying a crank, means to couple said driving mechanism and Workengaging element comprising a rigid link and a coupling mem-' ber, saidcoupling member being pivoted on the .link and movable transversely ofthe axis of the crank to and from a position of direct couplingengagement with the crank, and means to prevent said coupling memberfrom engaging the driving, mechanism ri id link and a coupling member tocouple said drivinrr means and work engaging ele ment to subject thework engaging element to a pressure when it reaches a predeterminedpoint in its working stroke, said coupling member being pivoted on thelink and movable transversely of the axis of the crank to and from aposition of direct coupling engagement with the crank, and

means to prevent coupling of the member and driving mechanism so as toprevent the Work engaging member from being subjected to pressure uponencountering an obstruction extraneous to the workbefore it reaches saidpredetermined pressure point.

10. In combination with a work engaging element'and driving mechanism,means comprising a yieldingly mounted rigid link and a coupling memberto couple said driving means and work engaging element to subject thework engaging element to pressure-when it reaches a predetermined pointin its working stroke, and "stationary cam means toicooperate with thecoupling member and preventcoupling of the member and driving mechanismto prevent the work engaging member from being subjected to pressureupon encountering an obstruction extraneous to the work before itreaches said pre determined pressure point, a stud shaft and bushingcarried by the Work en aging element; said stationary cam means havingits free end bifurcated to engage the bushing. 11. In combination with awork engaging element, driving mechanism therefor, and a stationaryelement to receive and resist pressure from the work engaging element, alink having a slot provided in one end through which said drivingmechanism freely travels independently of the link, a coupling memberpivotally mounted on the link for couplingsaid link to the drivingmechanism, by

' coupling member to coupling position when the path of the element isfree.

'12. In combination with a work engaging element and driving mechanism;means to connect said driving means and element comprising a rigid linkand a coupling member, said coupling member bein pivotally mounted onthe link and mova le to and from a coupling position of direct couplingengagement with the driving mechanism, and means to actuate the couplingmember into engagement with the driving mecha nism whereby to render thelink operative to exert pressure upon the element when its path is" freeand to render the link inoperative when the element encounters anobstruc- 1 tion in its path extraneous to the work.

In testimony whereof I afiix my signature in presence of two witnesses.

' CHARLES F. ROOT. Witnesses:

.JOHN H. Coss,

PEARL M. YUNCHER.

